Engine construction



May 22, 1928. 1,670,298 7 C. E. BONNER ENGINE CONSTRUCTION Filed April 28, 1921 2 Sheets-Sheet l I (El/6225f (045774856: [ire/z 0615072 2? @Q /ZM lw May 22, 1928. 1,670,298

C. E. BONNER ENGINE CONSTRUCTION Filed A ril 28, 1921 2 She ets-Sheet 2 k I [Zr/6W W656: Clarence I 50727287;

yaw -M,4q

Patented May 22, 19 28.

CLARENCE E. BONNER, OF YORK,

TO BONNER-CHARTER CORPORATION, DELAWARE.

Applieation filed April 28,

mounting the sleeve valve and its operating mit longitudinal expansion fprovide an internal ilk member, and it is essential for ease of assembly that the sleeve valve be removable upwardly from the cylinder block in order to avoid the necessity for completely tearing down the engine when cleaning or adjusting the valves. It is highly desirable for the same reasons that the inner cylinder member, where such a member is provided, he removable in the same manner. The inner cylinder member must be .accurately retained in place and be positively centered in order to secure the proper operation of the engine, and it is very necessary thatthe inner cylinder be positioned in such manner as to perthereof due to heating. It has been found highly. desirable that thesleeve valve extend substantially the full length of the cylinder and be driven and oiled from below in order to avoid complications in the castings and in the engine design. Theselong sleeves have also proved especially desirable in maintaining 'a close seal at the ports. n v

The expansion of the variousfmenibers caused by heating in engines of this type, where the inner cylinder is surrounded by a sleeve valve, often causes binding and pre vents proper operation. Due to the varying temperatures of the several elements when the engine is operated and their necessarily very close interlit, it, is highly, important that the temperature expansion be taken care of in some manner.

It is an object of the present invention to V combustion engine of the type described in whichthe inner. cylinder and sleeve valve are removable from the upper end of the cylinder block and in which the sleeve gear is integrally formed upon the sleeve and within the contour thereof.

It is a further object to so proportion the sleeve drive gear that the sleeve may be removed without removal of the drive gear.

It is an additional object to provide a' guide for the lower end of the cylinder,

1,670,298 UNITED STATES PATENT OFFICE.

a. Y., Assrenon, BY MESNE ASSIGNMENTS, or novEanELAwARn, A conromrron or ENGINE consrnuc'rron.

1921. Serial No. 465,176.

formed integrally with the cylinder casting.

It is alsoan object to form the sleeve valve .and the cylinder block of materials having diflerent coeflicients of expansion so that binding due to heating expansion is eliminated. n

Other and the description proceeds.

Broadly defined, my invention comprises an engine consisting of a cylinder block having openings therein adapted to receive inner cylinder members. The blocks are providedwith shoulders at their upper ends adapted to engage flanges upon the inner cylinder members and are provided adjacent the lower end of each inner cylinder with a shoulder adapted to serve as a guide for the cylinder. The sleeve valve is fitted between further objects will appear as the inner and outer cylinder members and bears upon a guide ring supported upon the guide shoulder. The sleeve valve has gear teeth cut within its contour adjacent its lower end and associated with a drive gear. WVhile the three members (the inner and outer cylinders andthe sleeve valve) may be formed of any desired metals whose coefiicients of expansion bear the necessary relation, 1 preferably form the cylinder casing of an aluminum. alloy, the sleeve valve or steel, and the inner cylinder of cast iron.

I have illustrated a preferred embodiment of my invention in the accompanying drawings, in which Figure 1 is a vertical section illustrating a one-cylinder engine made according to my invention;

Figure 2 is a horizontal section of Figure 1 taken on line 22; and i Figure 3 is a view of the sleeve valve member partly broken away. I

The engine comprises the lower crank case member 5 to which is fitted the cylinder block 6. The crank shaft 7 passes between these two members and is retained in bearings 8and 9. The left end of the engine is closed by the cover plate 10. The flywheel 11 is secured to the right end of the crank' shaft.

The inner cylinder member 12 is fitted into the cylinder block and is provided at its upper end with the flange 13 engaging the shoulder 14 on the cylinder block. The cylinder block is provided adjacent the lower end of the cylinder with the inwardly extending shoulder 15 which engagesthe cylinder and sci-Vegas aguide therefor. Upon the shoulder 15 is "a hardenedsteel guide ring 16 which closely engages the inner cylinderanemberand supports the sleeve valve member 17. l The piston18 fitswithin the inner cylinder member 12 and 1s connected to the crank shaft 7 by the connecting rod 19.

As shown in Figure 3, the sleeve valve member 17. is provided with the ports 20 and has its lowerwoater port'ioii cutflto itorm the gear 21. As best shown inFi'gure 2, this gear 21 is engaged by the worm gear 22 carried by the shaft as. This shalt 23 carries the gear :24: which'is driven from the gear mount-ed upon the crank shaft. These gears are preferably connected by a silent chain (not shown), g

The inner cylinder member 12 is provided with ports 26 adapted to react with the sleeve valve ports and with ports in the cylinder case. The cylinder head member 27 is provided with the inwardly extending central portion 28 which .c'losely fits the ,in terior of the cylinder 12. The member serves .to retain the inner cylinder members in .place and'the latter serves to hold in lace the sleeve valve. The cylinder head s secured to the cylinder block by the bolts 29 andnuts 80, a paper or other 'asket being used if desired to secure a tight joint for the water jaQket.

In assembling-1 the cylinder and valve structure, the valve sleeve drive gear may be already ,in place. The hardened steel guide ring 16 is first passed within the cylinder. opening, resting upon the shoulder 15. The sleeve valve member 17 is then insorted in the cylinder bloclr, it'being necessary of course to insert it insuc'h rotary position relative to the drive gear 25% as to properly time the opening and closing of the ports. In order that this member may be inserted and withdrawn without removal of the gear 22, the teeth upon the gear are cut through the lower edge of the gear. The inner cylinder member 13 is next inserted, the lower portion being guided by the shoulder 15 and the upper portionbeing accurate lycentered not only by its close ,fit with the sleeve valve, but more positively by the exactinterfit ot' the flange 13 with the shoulder portion 14 in thecylinder block. The cylinder head member 27 :is then put in ,place, its lower extension serving as additional means for accurately locating the cylinder. In reinoving tlie severaleleijncnts,

they are taken out in the reverse order.

This form of design makes it possible to tr mors and replace the semi-a1 (element without any extended taking down of the engine proper. Preferably the outer cylinder-block-(l is formed of aluminum alloy which has a comparatively high coetiicient of expansion and the sleeve valve member 17 is formed of steel having a lower coellicient of exliansion, while the inner der 1-2"is preferably formed of the usual gray cast 11'011 hav'in a still'lower coeificient of expansion. These variations in coeflicients of expansion are necessary to take care of heat. expansion, since the innermost member is heated at a higher temperature thanthe outer mem'bers,"not only becauseit is closer to the source of heat, but because the outer members are cooled by the water jacket. This particular combination of metals, or any similar combination of metals having the'same relation as regards eat )ansion and capable of withstanding the necessary strains, therefore aids 'very materially in eliminating any strainsor binding due to heat expansion.

I claim: In an engine construction, an outer cylinderblock, an inner cylinder consisting of a tubular member open at ibothends, ports cut in the sides of the cylinder, a circumferential flange on the upper end of, said inner cylinder engaging'a recess in the upper face of the cylinder block whereby the upper end of the cylinder is ce tiered-relative to the block,an inwardly exl ending ci'rcumferential shoulder on the outer cylinder adjacent the lower end of the inner cy-ll-nder and adapted to maintain the lower end of the inner cylinder in fixed relation to the outer cylinder, a bearing rjng carried by said shoulder, a valveslceve.carried between the inner and outer cylinder members and having its lower edge bearingupon the ring, the sleeve being relatively thick and having gear teeth cut therein adjacent the lower edge, and a gear engaging said teeth to rotate the sleeve, thelower edge of the sleeve being 'for1ned,'to permit removal of the sleeve upwardlv fromthciblock iwithout rcn'ioval of the coacting gear.

Signed at New York, New York, this 22nd day ofA ril,1921. CEA RE NCE E. BONNER. 

